<?php
/*
 * 	Class	数据库操作类
 *
 *  Author  Rakiy
 *
 *  DATA	2013-04-17
 *
 */
Class DB {
	private $link_id;
	private $time;
	
	public function __construct() {
        require_once("config.inc.php");
        $this->prefix = $db_config["prefix"];
        $this->authorId = $db_config["authorId"];
		$this->connect($db_config["hostname"], $db_config["username"], $db_config["password"], $db_config["database"], $db_config["charset"], $db_config["port"]);
	}
    //数据库连接
	public function connect($dbhost, $dbuser, $dbpw, $dbname,$charset='utf8',$port='3306', $pconnect = 0) {
        if( $pconnect==0 ) {
            $this->link_id = @mysql_connect("{$dbhost}:{$port}", $dbuser, $dbpw, true);
            if(!$this->link_id){
                $this->halt("数据库连接失败");
            }
        }else {
            $this->link_id = @mysql_pconnect($dbhost, $dbuser, $dbpw);
            if(!$this->link_id){
                $this->halt("数据库持久连接失败");
            }
        }
        if(!@mysql_select_db($dbname,$this->link_id)) {
            $this->halt('数据库选择失败');
        }
        @mysql_query("set names ".$charset);
    }
    //查询
    public function query($sql) {
        $query = mysql_query($sql,$this->link_id);
        if(!$query) $this->halt('Query Error: ' . $sql);
        return $query;
    }
    //获取一条记录（MYSQL_ASSOC，MYSQL_NUM，MYSQL_BOTH）             
    public function get_one($sql,$result_type = MYSQL_ASSOC) {
        $query = $this->query($sql);
        $rt =& mysql_fetch_array($query,$result_type);
        return $rt;
    }
    //获取全部记录
    public function get_all($sql,$result_type = MYSQL_ASSOC) {
        $query = $this->query($sql);
        $i = 0;
        $rt = array();
        while($row =& mysql_fetch_array($query,$result_type)) {
            $rt[$i]=$row;
            $i++;
        }
        return $rt;
    }
    //插入
    public function insert($table,$dataArray) {
        $field = "";
        $value = "";
        if( !is_array($dataArray) || count($dataArray)<=0) {
            $this->halt('没有要插入的数据');
            return false;
        }
        while(list($key,$val)=each($dataArray)) {
            $field .="$key,";
            $value .="'$val',";
        }
        $field = substr( $field,0,-1);
        $value = substr( $value,0,-1);
        $sql = "insert into $table($field) values($value)";
        if(!$this->query($sql)) return false;
        return true;
    }
    //更新
    public function update( $table,$dataArray,$condition="") {
        if( !is_array($dataArray) || count($dataArray)<=0) {
            $this->halt('没有要更新的数据');
            return false;
        }
        $value = "";
        while( list($key,$val) = each($dataArray))
		$value .= "$key = '$val',";
        $value .= substr( $value,0,-1);
        $sql = "update $table set $value where 1=1 and $condition";
        if(!$this->query($sql)) return false;
        return true;
    }
    //删除
    public function delete( $table,$condition="") {
        if( empty($condition) ) {
            $this->halt('没有设置删除的条件');
            return false;
        }
        $sql = "delete from $table where 1=1 and $condition";
        if(!$this->query($sql)) return false;
        return true;
    }
    //返回结果集
    public function fetch_array($query, $result_type = MYSQL_ASSOC){
        return mysql_fetch_array($query, $result_type);
    }
    //获取记录条数
    public function num_rows($results) {
        if(!is_bool($results)) {
            $num = mysql_num_rows($results);
            return $num;
        } else {
            return 0;
        }
    }
    //释放结果集
    public function free_result() {
        $void = func_get_args();
        foreach($void as $query) {
            if(is_resource($query) && get_resource_type($query) === 'mysql result') {
                return mysql_free_result($query);
            }
        }
    }

    //获取最后插入的id
    public function insert_id() {
        $id = mysql_insert_id($this->link_id);
        return $id;
    }

    //关闭数据库连接
    protected function close() {
        return @mysql_close($this->link_id);
    }

    //错误提示
    private function halt($msg='') {
        $msg .= "\r\n".mysql_error();
        die($msg);
    }

    //析构函数
    public function __destruct() {
        $this->free_result();
    }
}
?>
